Safety stop-valve.



PATENTED AUG. 7, 1906. 0. W. NICHOLSON.

SAFETY STOP VALVE. APPLICATION FILED NOV. 16. 1905.

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CHARLES WILLIAM NICHOLSON, OF ROSLYN, WASHINGTON.

SAFETY STOP-VALVE.

Specification of Letters Patent.

Patented Aug. '7, 1906.

Application filed November 16, 1905. Serial No. 287,612.

To all whmn it may concern:

Be it known that I, CHARLES WILLIAM NICHOLSON, a citizen of the United States, and a resident of Roslyn, in the county of Kittitas and State of Washington, have invented a new and Improved Safety Stop- Valve, of which the following is a full, clear, and exact description.

My invention relates to a valve and to mechanism for operating it whereby it can be automatically closed when predetermined conditions take place and also whereby it can be controlled by hand.

The principal objects of the invention are to improve and simplify the construction of valves of this general character in such a way as to afford an assurance that the valve will become seated at the proper time, to provide for easy and eflicient operation of the same,

and to afford an improved automatic controlling device.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the fig- 'ures.

Figure 1 is a side elevation, partly in section, of a valve-casing, showing attachments which constitute apart of my invention. Fig.

2 is a sectional view of the same on the line 2 valve-seat employed in the device.

I have shown a valve-casing a, having an inlet and outlet for steam or other fluid. At one side of this casing is located aplate I), hav ing a valve-seat b and a pair of tracks or ways b These tracks are provided with two sets of depressions b and b. The de pressions 6?, which are located on the side of the valve-seat next to the long portion of the track, are shorter, than the depressions I). These depressions have a curved outline for permitting them to support wheels 0 and c. The wheels 0 correspond with the depressions b and the wheels 0 with the depressions I), having faces of different lengths, as described above. The purpose of this is to permit the wheels 0 to pass over the depressions b when the valve (1, which is supported by the wheels.

downwardly-extending projection e on each end adapted to engage the flanges d. It will be obvious that if the slide 6 is moved back and forth upon its ways the projections 6, being within the box-valve d, it will cause the latter to move with it longitudinally on the wheels 0 and 0, but the valve will be free to move up I when the wheels strike the depressions in the tracks b the box-valve can drop to its seat.

In order to provide for moving the slide and valve in this way, the former is provided with a pair of racks c and a pair of pinions f are mounted upon a shaft f so as to engage the racks. These pinions are held apart by a split collar f located between them, the split being provided in order to allow a key to pass along the shaft and engage both pinions. The shaft is mounted in bearings in a pair of studs 9 and g, which are screwed into openings in the opposite sides of the valve-casing, a packing-box it being employed to avoid the loss of steam or other fluid at these points. The shaft f is provided with a hand-wheel f by means of which it can be manipulated by hand in an obvious manner. It is also provided with a drum f which has flanges thereon for guiding a rope or cord and a perforationf, through which the end of said rope or cord may be passed and secured to the drum and down, and consequently This cord or other flexible connection is The drum is provided with a notch f, in

which is adapted to engage a tooth m upon a trigger m, pivoted on a frame m In order to pull the trigger, it is provided with a projection m with which is connected an operating-spring m An electromagnet 0 is provided with an armature 0 for controlling the trigger on the frame m This armature is mounted onand controls a pivoted catch which holds the trigger. A spring g normal y forces the catch into engagement with the trigger until the magnet is energized. It will be understood that the electromagnet is connected up in such a way that when it becomes necessary to close the valve it will automatically be energized and attract the armature if it is worked on an open-circuit system, so as to withdraw the trigger from the notch f and permit the weight to operate,

When used with a closed system, the operation is the reverse. A by-pass 7", having a valve 1 connects the admissionsteam-pipe with the bottom plate of the valve. When the valve d has been closed, the by-pass valve is opened to equalize the pressure on the valve (2 and permit it to be opened easily.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination with a casing havin a valve-seat, of a reciprocable valve, means for moving the valve over and away from over the valve-seat, and means for permitting the valve to drop upon the seat when directly thereabove.

2. The combination with the casing having a valve-seat, of a reciprocable valve, a shaft journaled in the case, means whereby the rotation of the shaft will reciprocate the valve, and means for automatical y rotating the shaft.

3. The combination with the casing having a valve-seat, of a reciprocable valve, a shaft journaled in the case, means whereby the rotation of the shaft will reciprocate the valve, means for automatically rotating the shaft, means for restrainin said rotation, and electromagnetic means for releasing the restraining means.

4. The combination of a reciprocable valve, a pair of racks connected with the valve, a pair of pinions adapted to mesh with said racks for reciprocating the valve, a shaft upon which said pinions are mounted, a collar on the shaft between the pinions for keeping them apart, a valve-casing in which said valve is mounted, a pair of studs mounted in opposite sides of the said valve-casing and having bearings for said shaft, and means on said shaft for automatically closing said valve.

5. The combination of areciprocable valve having outwardly-extending flanges, a slide having projections located between said flanges, whereby a reciprocating motion of the slide will be transmitted to the valve while the valve is free to move in a direction transverse to the reciprocating motion, a rack connected with said slide, and means for operating the rack and slide.

6. The combination of a reciprocable valve having outwardly-extending flanges, and a slide located at the rear of said valve and having projections loosely fitting between said flanges.

7. The combination of a reciprocable valve having flanges spaced apart, a casing in which said valve is mounted, said casing having ways upon its sides, and a slide mounted on said ways and having projections extending between said flanges.

8. The combination of a reciprocating valve having outwardlyextending flanges, a slide located at the rear of said valve and having projections loosely fitting between said flanges, wheels on which said valve is adapted to move, and a track for said wheels.

9. The combination of a valve-casing having a seat, a pair of tracks located on opposite sides of said seat, and a valve for said seat, said valve having wheels adapted to travel on said track.

10. The combination of a Valve-casing having a seat, a pair of tracks located on opposite sides of said seat, and a valve for said seat, said valve having wheels adapted to travel on said track, the wheels located on one side of said seat having a wider face than those locatedon the other, and the track having depressions for said wheels, said depressions corresponding in Width to the width of the wheels.

1 1. The combination of a valve-casing having a seat, tracks located adjacent to the seat and having depressions, and a valve having wheels adapted to enter said depressions.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CHARLES WILLIAM NICHOLSON.

Witnesses:

NETTIE SMITH, HENRY SMITH 

